The love interest character's clothes got destroyed due to plot reasons, so she had to fashion new ones that amount to basically a halter top and hot pants that she wears under her full samurai armour. The main character goes 
while another one explains how being half-naked will somehow make her much more mobile during fights. Why aren't the male characters stripping down to their underpants then 
What makes this especially aggravating is that her original outfit was a really cool and non-horny female samurai design 
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From Software owns the rights and Sekiro started out as a Tenchu reboot, apparently
I just wanna toss poisoned rice balls onto a hapless guard's patrol route from a rooftop and watch him keel over dead when he happily eats them